High-precision desulfurization slurry density measuring device
By designing a high-precision desulfurization slurry density measurement device using weighing modules and driving modules, the problem of inaccurate measurement results of existing devices is solved, and the stable operation of the desulfurization system and the safety of the equipment are achieved.
Patent Information
- Application Number
- CN202421654105.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The existing desulfurization slurry density measurement devices have the problem of inaccurate measurement results, which leads to unstable operation of the desulfurization system, intensified wear of equipment, and even affects the safe operation of the system.
A high-precision desulfurization slurry density measurement device is designed, using a weighing module and a driving module. Through the reciprocating movement of the driving module, the slurry is driven to circulate and flow in the measuring cylinder, and the density of the slurry is calculated based on the change in the slurry weight in the measuring cylinder.
It realizes high-precision slurry density measurement, ensures stable operation of the desulfurization system, avoids equipment wear and system safety risks, is convenient to operate and maintain, and has low process costs.
Smart Images
Figure CN222926580U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of inspection and testing, and particularly relates to a high-precision desulfurized slurry density measuring device. Background Technique
[0002] The limestone-gypsum wet flue gas desulfurization technology is the most mature, stable and reliable desulfurization process at present, and the desulfurization efficiency can reach more than 99%. Its process system mainly includes a flue gas system, a sulfur dioxide absorption system, a limestone slurry preparation system, an oxidation air system, a gypsum dehydration system, etc. This technology uses fine powder of limestone ground with water as raw materials to make limestone slurry, which fully contacts with flue gas in the desulfurization tower to achieve the purpose of removing sulfur dioxide.
[0003] In the limestone-gypsum wet flue gas desulfurization technology, the size of the slurry density directly affects the operation status of the desulfurization system. Generally speaking, a relatively high slurry density will cause an increase in the current of the slurry circulation pump, the gypsum discharge pump, and the absorber stirrer, which will further increase the working load of the equipment and the power consumption; it will also aggravate the wear of the desulfurization system equipment, resulting in a decrease in the equipment output, and in severe cases, it will lead to pipeline leakage and equipment damage; it will also cause the slurry to stay on the surface of the tower components and scale, causing blockage of components such as pipelines and filters, affecting the normal operation of the system. If the slurry density is too low, it will cause phenomena such as too low desulfurization efficiency, poor gypsum quality, and difficult dehydration. In addition, the measurement of the absorber liquid level is generally calculated by combining the slurry density and the pressure at the bottom of the absorber. It can be seen that the measurement of the absorber liquid level depends on the measurement result of the slurry density, and inaccurate measurement results of the slurry density may cause slurry overflow, and in severe cases, it may even affect the safe operation of the unit.
[0004] Therefore, the accurate measurement of the absorber slurry density plays a crucial role in the stable operation of the desulfurization system. The density meters used in the desulfurization tower are mainly mass flow meters, differential pressure density meters, nuclear density meters, and tuning fork density meters according to different measurement principles. Since the core component of the nuclear density meter is a radiation source, the management costs of personnel and equipment are high, so it is less used; since the tuning fork density meter has few application cases and the maintenance personnel lack relevant experience, it will also be avoided when selecting equipment. The mass flow meter and the differential pressure density meter have better applicability.
[0005] The currently applied mass flow meter and differential pressure density meter can operate stably, but there are certain problems. For example, when the mass flow meter is installed horizontally, the sedimentation of slurry suspended matter causes blockage, and long-term operation in the slurry condition will also cause wear of the density meter; for some mass flow meters installed vertically (downcomer), during measurement, since the slurry cannot fill the measurement pipeline, gas enters the density meter along the pipeline, resulting in bubbles in the density meter and causing the measurement result to jump.
[0006] The differential pressure densitometer is installed on the absorption tower wall. During the operation of the agitator in the tower, the pulsating flow is conducted to the differential pressure transmitter, causing disturbances. Moreover, the distances between the differential pressure transmitter and each agitator are different, resulting in the inability to cancel out the disturbances generated by the agitators and causing inaccurate measurement results.
[0007] The above statement of the background art is only for the convenience of deeply understanding the technical solution of the present utility model (such aspects as the technical means used, the technical problems solved, and the technical effects produced), and should not be regarded as an admission or an indication in any form that this information constitutes the prior art known to those skilled in the art. Summary of the Utility Model
[0008] The present utility model aims to solve the above technical problems at least to a certain extent. For this purpose, the object of the present utility model is to provide a high-precision desulfurized slurry density measuring device.
[0009] The technical solution adopted by the present utility model is as follows:
[0010] A high-precision desulfurized slurry density measuring device includes a weighing module. A measuring cylinder and a driving module are provided on the weighing module. A piston is arranged in the measuring cylinder. The piston is connected to a pull rod, and the pull rod is connected to the driving module. The inlet and outlet of the measuring cylinder are connected to the slurry pipeline through a hose. The slurry pipeline includes a slurry inlet valve, a water inlet valve, a slurry discharge valve, and a four-way joint. The four-way joint is respectively connected to the slurry valve, the water inlet valve, the slurry discharge valve, and the hose.
[0011] Preferably, the measuring cylinder is inclined. The inlet and outlet of the measuring cylinder are located at the higher end of the measuring cylinder. The included angle between the measuring cylinder and the horizontal plane is 2 - 5°.
[0012] Preferably, both the weighing module and the driving module are electrically connected to a control module. The control module is also electrically connected to the slurry inlet valve, the water inlet valve, and the slurry discharge valve.
[0013] Preferably, a waste water collection pool is provided below the slurry discharge valve. A cylindrical cavity is arranged inside the measuring cylinder. The piston is slidably and sealingly installed in the cylindrical cavity. The driving module is driven by a cylinder or a servo motor equipped with a planetary reducer.
[0014] Preferably, the volume of the cylindrical cavity is 500 - 2000 ml, the measuring range of the weighing module is 20 - 50 kg, the inner diameter of the hose is 15 - 25 mm, and the length of the hose is 10 - 20 cm.
[0015] The beneficial effects of the present utility model are as follows:
[0016] The high-precision desulfurized slurry density measuring device of the present utility model drives the reciprocating motion of the driving module to drive the slurry to circulate in the measuring cylinder, and calculates the density of the slurry according to the change in the weight of the slurry in the measuring cylinder. The device has a simple and novel structure, high detection accuracy, can effectively avoid the problem of inaccurate measurement results of existing density meters, ensure the stable operation of the desulfurization system, and is convenient for operation and maintenance with low process costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic diagram of the high-precision desulfurized slurry density measuring device of the present utility model.
[0018] In the figure: 1 - slurry pipeline; 2 - measuring cylinder; 3 - weighing module; 4 - driving module; 5 - control module; 6 - waste water collection pool; 7 - slurry inlet valve; 8 - water inlet valve; 9 - slurry discharge valve; 10 - pull rod; 11 - hose. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model. The components of the embodiments of the present utility model described and shown in the drawings here can generally be arranged and designed in a variety of different configurations.
[0020] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive distinction and should not be construed as indicating or implying relative importance.
[0021] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements.
[0022] Such as Figure 1As shown in the figure, a high-precision desulfurized slurry density measuring device according to this embodiment mainly includes a slurry pipeline 1, a measuring cylinder 2, a weighing module 3, a driving module 4, and a control module 5. The measuring cylinder 2 and the driving module 4 are both arranged on the weighing module 3. The measuring cylinder 2 is internally provided with a cylindrical cavity, and a piston is slidably and sealingly installed in the cylindrical cavity. The piston is connected to a pull rod 10, and the pull rod 10 is connected to the driving module 4. The inlet and outlet of the measuring cylinder 2 are connected to the slurry pipeline 1 through a wear-resistant hose 11. The driving module is driven by a cylinder or a servo motor equipped with a planetary reducer. When the driving module moves, it can drive the piston to move in the measuring cylinder 2 through the pull rod 10, thereby driving the liquid to flow in the measuring cylinder.
[0023] The slurry pipeline 1 includes a slurry inlet valve 7, a water inlet valve 8, a slurry discharge valve 9, and a four-way joint. The four-way joint is respectively connected to the slurry valve 7, the water inlet valve 8, the slurry discharge valve 9, and the hose 11. A waste water collection pool 6 is provided below the slurry discharge valve 9.
[0024] The control module 5 is electrically connected to the weighing module 3, the driving module 4, the slurry inlet valve 7, the water inlet valve 8, and the slurry discharge valve 9 respectively. Thus, the weighing module 3, the driving module 4, the slurry inlet valve 7, the water inlet valve 8, and the slurry discharge valve 9 can all be remotely operated through the control module 5. The control module 5 can adjust the liquid inlet speed, the liquid discharge speed, and the measurement period of the slurry density by controlling the above-mentioned components. By adjusting the slurry flow rate in and out of the measuring cylinder 2, the erosion and wear of the slurry on the density measuring device can be reduced, and the service life of the density measuring device can be effectively improved.
[0025] The measuring cylinder 2 is inclined. The inlet and outlet of the measuring cylinder 2 are the same opening, and the inlet and outlet are located at the higher end of the measuring cylinder 2. The included angle between the measuring cylinder 2 and the horizontal plane (measurement plane) is 2 - 5°. By setting the measuring cylinder 2 at a certain inclination angle with the horizontal plane, it can be ensured that the slurry fills the measuring cylinder 2 during measurement, and it is not affected by the impact, waves, and turbulence of the mechanical stirring in the desulfurization absorption tower. The accuracy of the detection result can be effectively improved, and the operation and maintenance are simple and the cost is low. It can overcome the problems of jump of the traditional mass flowmeter and interference of the result of the differential pressure density meter by the agitator.
[0026] In this embodiment, the measuring cylinder 2, the pull rod 10, and the piston are all made of wear-resistant materials. The volume of the cylindrical cavity of the measuring cylinder 2 is 500 - 2000 ml, the measuring range of the weighing module 3 is 20 - 50 kg, and the comprehensive accuracy of the weighing module 3 is 0.05% of the full scale. The inner diameter of the hose 11 is 15 - 25 mm, and the length of the hose 11 is 10 - 20 cm.
[0027] The usage method of the high-precision desulfurized slurry density measuring device is as follows:
[0028] S1. Calibration:
[0029] Before calibration, the weighing module 3 is tared. After the control module 5 displays that the taring is completed, the slurry inlet valve 7 is closed, the water inlet valve 8 is opened, the slurry discharge valve 9 is closed, and the measuring cylinder 2 is opened. Process water enters the measuring cylinder 2 through the water inlet valve 8. After the measuring cylinder 2 is filled with the process water, the drive module 4 pauses and closes the water inlet valve 8, opens the slurry discharge valve 9, exhausts the air, then opens the water inlet valve 8, closes the slurry discharge valve 9, and fills the measuring cylinder 2 with water again. After standing for a period of time, the weighing sensor 3 records the total weight of the water inlet m 水 , after the control module 5 displays that the weighing is completed, the process water in the measuring cylinder 2 is drained, and the calibration process is completed.
[0030] S2. Measurement:
[0031] During measurement, the slurry inlet valve 7 is opened, the water inlet valve 8 is closed, and the slurry discharge valve 9 is closed. The slurry to be measured enters the measuring cylinder 2 through the slurry inlet valve 7. After the measuring cylinder 2 is filled with the slurry, the drive module 4 briefly stops and then changes the direction of movement. After exhausting the air, the drive module 4 changes the direction of movement again to fill the measuring cylinder 2 with the slurry again. After standing for a period of time, the weighing sensor 3 records the total weight of the slurry inlet m 浆 , after the control module 5 displays that the weighing is completed, the slurry in the measuring cylinder 2 is drained, and the single slurry density measurement is completed;
[0032] The density of the slurry is calculated based on the density of water, ρ 浆 = m 浆 *ρ 水 / m 水 , ρ 浆 is the slurry density, and ρ 水 is the density of the process water.
[0033] S3. Flushing:
[0034] The slurry inlet valve 7 is closed, the water inlet valve 8 is opened, and the slurry discharge valve 9 is closed. Process water enters the measuring cylinder 2 through the water inlet valve 8. After the measuring cylinder 2 is filled with the process water, the water inlet valve 8 is closed and the slurry discharge valve 9 is opened to drain the flushing water in the measuring cylinder 2. The flushing water is discharged into the waste water collection tank 6. Repeat the above operations until the flushing water is clean and transparent, then the flushing is completed.
[0035] Flushing can avoid slurry residue, affect the accuracy of the results, and at the same time reduce the wear of the measuring cylinder.
[0036] The exhaust mentioned in the above steps refers to discharging 1 / 10 - 1 / 5 of the total volume of the measuring cylinder of the liquid, thereby discharging the gas brought in during liquid inlet and ensuring that the liquid can fill the measuring cylinder.
[0037] During measurement, the measurement period can be set according to the actual operating conditions of the desulfurization tower; meanwhile, the liquid inlet speed and the liquid discharge speed can be adjusted through the control module 5 to minimize the wear of the slurry on the density measuring device under the condition of ensuring the accuracy of the detection results.
[0038] The present utility model is not limited to the above optional embodiments, and any person can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they are all within the protection scope of the present utility model.
Claims
1. A high-precision desulfurization slurry density measuring device, characterized in that: The weighing module (3) comprises a measuring cylinder (2) and a driving module (4) provided on the weighing module (3); a piston is provided in the measuring cylinder (2); the piston is connected to a pull rod (10); the pull rod (10) is connected to the driving module (4); the inlet and outlet of the measuring cylinder (2) are connected to a slurry pipeline (1) via a hose (11); the slurry pipeline (1) comprises a slurry inlet valve (7), a water inlet valve (8), a slurry discharge valve (9) and a four-way joint; the four-way joint is respectively connected to the slurry valve (7), the water inlet valve (8), the slurry discharge valve (9) and the hose (11).
2. The high-precision desulfurization slurry density measuring device according to claim 1 is characterized in that: The measuring tube (2) is arranged tilted, the inlet and outlet of the measuring tube (2) are located at the higher end of the measuring tube (2), and the smaller angle between the measuring tube (2) and the horizontal plane is 2-5°.
3. The high-precision desulfurization slurry density measuring device according to claim 1 is characterized in that: The weighing module (3) and the driving module (4) are both electrically connected to the control module (5).
4. The high-precision desulfurization slurry density measuring device according to claim 3 is characterized in that: The control module (5) is also electrically connected to the slurry inlet valve (7), the water inlet valve (8) and the slurry discharge valve (9).
5. The high-precision desulfurization slurry density measuring device according to claim 1 is characterized in that: A wastewater collection tank (6) is provided below the slurry discharge valve (9).
6. The high-precision desulfurization slurry density measuring device according to claim 1 is characterized in that: A cylindrical cavity is provided inside the measuring cylinder (2), and a piston is slidingly and sealingly installed in the cylindrical cavity.
7. The high-precision desulfurization slurry density measuring device according to claim 1 is characterized in that: The driving module is driven by a cylinder or a servo motor equipped with a planetary reducer.
8. The high-precision desulfurization slurry density measuring device according to claim 6 is characterized in that: The volume of the cylindrical cavity is 500-2000ml.
9. The high-precision desulfurization slurry density measuring device according to claim 1 is characterized in that: The weighing module (3) has a measuring range of 20-50 kg.
10. The high-precision desulfurization slurry density measuring device according to claim 1 is characterized in that: The inner diameter of the hose (11) is 15-25 mm, and the length of the hose (11) is 10-20 cm.